Merch Bradt Stewart (June 24, 1875 – July 3, 1934), often called M. B. Stewart was a writer, educator, and career United States Army officer who became superintendent of the United States Military Academy. Stewart authored several U.S. Army manuals, penned a popular narrative of his considerable experiences as second lieutenant in the Spanish–American War, and in the years preceding World War I wrote essays informing the public on issues of physical and military education.